PMID- 32655553 OWN - NLM STAT- MEDLINE DCOM- 20210405 LR - 20210405 IS - 1664-3224 (Electronic) IS - 1664-3224 (Linking) VI - 11 DP - 2020 TI - Peptidylarginine Deiminase 4 Promotes the Renal Infiltration of Neutrophils and Exacerbates the TLR7 Agonist-Induced Lupus Mice. PG - 1095 LID - 10.3389/fimmu.2020.01095 [doi] LID - 1095 AB - Peptidylarginine deiminase 4 (PAD4), encoded by PADI4, plays critical roles in the immune system; however, its contribution to the pathogenesis of lupus nephritis remains controversial. The pathological roles of PAD4 were investigated in lupus model mice. An imiquimod (IMQ)-induced lupus model was analyzed in wild-type (WT) and Padi4-knockout (KO) mice. Proteinuria, serum anti-double stranded DNA (anti-dsDNA) antibody, and renal infiltrated cells were evaluated. Neutrophil migration and adhesion were assessed using adoptive transfer and adhesion assay. PAD4-regulated pathways were identified by RNA-sequencing of Padi4 KO neutrophils. Padi4 KO mice exhibited significant improvements in proteinuria progression compared with WT mice, whereas, serum anti-dsDNA antibody and immune complex deposition in the glomeruli showed no difference between both mice strains. Padi4 KO mice showed decreased neutrophil infiltration in the kidneys. Adoptively transferred Padi4 KO neutrophils showed decreased migration to the kidneys of IMQ-treated WT mice, and adhesion to ICAM-1 was impaired in Padi4 KO neutrophils. Padi4 KO neutrophils exhibited reduced upregulation of p38 mitogen-activated protein kinase (MAPK) pathways. Toll-like receptor 7 (TLR7)-primed Padi4 KO neutrophils demonstrated reduced phosphorylation of p38 MAPK and lower expression of JNK-associated leucine zipper protein (JLP), a p38 MAPK scaffold protein. Neutrophils from heterozygous Jlp KO mice showed impaired adhesion to ICAM-1 and decreased migration to the kidneys of IMQ-treated WT mice. These results indicated a pivotal role of PAD4-p38 MAPK pathway in renal neutrophil infiltration in TLR7 agonist-induced lupus nephritis, and the importance of neutrophil-mediated kidney inflammation. Inhibition of the PAD4-p38 MAPK pathway may help in formulating a novel therapeutic strategy against lupus nephritis. CI - Copyright (c) 2020 Hanata, Shoda, Hatano, Nagafuchi, Komai, Okamura, Suzuki, Gunarta, Yoshioka, Yamamoto and Fujio. FAU - Hanata, Norio AU - Hanata N AD - Department of Allergy and Rheumatology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. FAU - Shoda, Hirofumi AU - Shoda H AD - Department of Allergy and Rheumatology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. FAU - Hatano, Hiroaki AU - Hatano H AD - Department of Allergy and Rheumatology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. FAU - Nagafuchi, Yasuo AU - Nagafuchi Y AD - Department of Allergy and Rheumatology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. FAU - Komai, Toshihiko AU - Komai T AD - Department of Allergy and Rheumatology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. FAU - Okamura, Tomohisa AU - Okamura T AD - Department of Functional Genomics and Immunological Diseases, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. FAU - Suzuki, Akari AU - Suzuki A AD - Laboratory for Autoimmune Diseases, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan. FAU - Gunarta, I Ketut AU - Gunarta IK AD - Division of Molecular Cell Signaling, Cancer Research Institute, Kanazawa University, Kanazawa, Japan. FAU - Yoshioka, Katsuji AU - Yoshioka K AD - Division of Molecular Cell Signaling, Cancer Research Institute, Kanazawa University, Kanazawa, Japan. FAU - Yamamoto, Kazuhiko AU - Yamamoto K AD - Laboratory for Autoimmune Diseases, RIKEN Center for Integrative Medical Sciences, Yokohama, Japan. FAU - Fujio, Keishi AU - Fujio K AD - Department of Allergy and Rheumatology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20200623 PL - Switzerland TA - Front Immunol JT - Frontiers in immunology JID - 101560960 RN - 0 (Adaptor Proteins, Signal Transducing) RN - 0 (Membrane Glycoproteins) RN - 0 (Spag9 protein, mouse) RN - 0 (Tlr7 protein, mouse) RN - 0 (Toll-Like Receptor 7) RN - EC 2.7.11.24 (p38 Mitogen-Activated Protein Kinases) RN - EC 3.5.3.15 (Padi4 protein, mouse) RN - EC 3.5.3.15 (Protein-Arginine Deiminases) SB - IM MH - Adaptor Proteins, Signal Transducing/genetics/metabolism MH - Adoptive Transfer MH - Animals MH - Disease Models, Animal MH - Female MH - Gene Expression Regulation MH - Kidney/*immunology/pathology MH - Lupus Nephritis/enzymology/*etiology/immunology MH - MAP Kinase Signaling System MH - Membrane Glycoproteins/*agonists MH - Mice MH - Mice, Inbred C57BL MH - Mice, Knockout MH - Neutrophil Infiltration/genetics/*physiology MH - Neutrophils/enzymology/immunology/pathology MH - Protein-Arginine Deiminases/deficiency/genetics/*metabolism MH - RNA-Seq MH - Toll-Like Receptor 7/*agonists MH - p38 Mitogen-Activated Protein Kinases/metabolism PMC - PMC7324481 OTO - NOTNLM OT - JNK-associated leucine zipper protein OT - lupus nephritis OT - neutrophil OT - p38 mitogen-activated protein kinase OT - peptidylarginine deiminase 4 EDAT- 2020/07/14 06:00 MHDA- 2021/04/07 06:00 PMCR- 2020/01/01 CRDT- 2020/07/14 06:00 PHST- 2020/01/09 00:00 [received] PHST- 2020/05/06 00:00 [accepted] PHST- 2020/07/14 06:00 [entrez] PHST- 2020/07/14 06:00 [pubmed] PHST- 2021/04/07 06:00 [medline] PHST- 2020/01/01 00:00 [pmc-release] AID - 10.3389/fimmu.2020.01095 [doi] PST - epublish SO - Front Immunol. 2020 Jun 23;11:1095. doi: 10.3389/fimmu.2020.01095. eCollection 2020.